A 2014 NASA's Goddard Space Flight Center study reminds us that ____.?
A) ?by increasing the per-capita depletion of nature, a collapse in civilization can be avoided
B) ?Earth's natural replacement capacity is well below its total possible capacity
C) ?civilizations are not permanent
D) ?nature has a way of maintaining equilibrium on its own, thus allowing civilization to thrive indefinitely
C
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The parts of Australia that are least subject to drought are
A. Around the coasts B. In the interior C. At Ayres Rock D. In the far west
The deep zone comprises about ____ of total ocean volume
a. 10% b. 30% c. 50% d. 80% e. 95%
The sun's radiance usually has a ____ variation
A) 1% B) 10% C) 20% D) 40%
Many metallic mineral deposits such as copper, gold, lead, silver, tin, and zinc are related to igneous and associated ____ activity
A)metamorphic B)subducting C)hydrothermal D)transform fault E)sedimentary